25809019405923 has 32 divisors (see below), whose sum is σ = 39388317928960. Its totient is φ = 14900470732800.

The previous prime is 25809019405907. The next prime is 25809019405927. The reversal of 25809019405923 is 32950491090852.

It is a happy number.

It is not a de Polignac number, because 25809019405923 - 2⁴ = 25809019405907 is a prime.

It is a super-4 number, since 4×25809019405923⁴ (a number of 55 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (25809019405927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169001278 + ... + 169153923.

It is an arithmetic number, because the mean of its divisors is an integer number (1230884935280).

Almost surely, 2^{25809019405923} is an apocalyptic number.

25809019405923 is a deficient number, since it is larger than the sum of its proper divisors (13579298523037).

25809019405923 is a wasteful number, since it uses less digits than its factorization.

25809019405923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338155339.

The product of its (nonzero) digits is 6998400, while the sum is 57.

The spelling of 25809019405923 in words is "twenty-five trillion, eight hundred nine billion, nineteen million, four hundred five thousand, nine hundred twenty-three".